package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    private List<String> backList = new ArrayList<>();

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        String remoteHost = request.getRemoteAddr();
        if (!(remoteHost.contains("0:0:0:0:0:0:0:1")||remoteHost.contains("127.0.0.1"))){
            log.info("host:{},{}",remoteHost,request.getRequestURI());
            response.setStatus(401);
            return false;
        }

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        // token  名称  authentication
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{},{}", token,request.getRequestURL());

            // 验证token 是否被篡改，是否过期
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户的id：", userId);
            // 放入threadlocal
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            ex.printStackTrace();

            //4、不通过，响应401状态码,401,token有问题，重新登录  403 无权限
            response.setStatus(401);
            return false;
        }
    }
}